1. Department of Periodontology and Community Dentistry, University College Hospital, Ibadan, Nigeria;
2. Department of Medicine, University College Hospital, Ibadan, Nigeria;
3. Department of Oral and Maxillofacial Surgery, University College Hospital, Ibadan, Nigeria;
4. Department of Medical Microbiology, University College Hospital, Ibadan, Nigeria;
5. Department of Surgery, Obafemi Awolowo University Teaching Hospital, Ile-Ife, Nigeria;
6. Department of Community Medicine, Ahmadu Bello University Teaching Hospital, Zaria, Nigeria;
7. Department of Psychiatry, Lagos State University/Lagos State University Teaching Hospital, Lagos, Nigeria;
8. Department of Community Medicine, University of Ibadan/University College Hospital, Ibadan, Nigeria;
9. Department of Community Medicine, Federal Teaching Hospital, Ido-Ekiti, Nigeria;
10. Department of Community Medicine, College of Medicine and Health Sciences, Afe Babalola University, Ado-Ekiti, Nigeria.